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Finding DNS static records

An interesting question from the forums about finding DNS static records

 

You can view the records in a DNS zone

Get-CimInstance -Namespace root\MicrosoftDNS -ClassName MicrosoftDNs_Atype -ComputerName W16DC01  -Filter "DomainName = 'manticore.org'" |
select OwnerName, Timestamp, IPAddress

 

but how do you know which are static records.

 

There isn’t an obvious way to do it but if you dig into the records (hint create a static record and look at the differences) you’ll see that static records have a timestamp of 0

 

So to see just the static records

Get-CimInstance -Namespace root\MicrosoftDNS -ClassName MicrosoftDNs_Atype -ComputerName W16DC01 -Filter "DomainName = 'manticore.org' AND Timestamp = 0" |
select OwnerName, Timestamp, IPAddress

 

Rather than using the CIM class directly it’s simpler to use the cmdlets from the DNSserver module – install the remote admin tools to get access.

 

To view the A type records

Get-DnsServerResourceRecord -ComputerName W16DC01 -ZoneName 'manticore.org' -RRType A

 

To view the static records only

Get-DnsServerResourceRecord -ComputerName W16DC01 -ZoneName 'manticore.org' -RRType A |
where {-not $_.TimeStamp}

 

Notice that you’re checking for the absence of a timestamp

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